Particle image velocimetry applied to study of a ventricular assist device

2004 ◽  
Author(s):  
E. Ferrara ◽  
Mikiya Muramatsu ◽  
I. A. Cestari
Keyword(s):  
Particle Image Velocimetry ◽  
Ventricular Assist Device ◽  
Particle Image ◽  
Assist Device ◽  
Ventricular Assist ◽  
Image Velocimetry

scholarly journals Methods for determination of stagnation in pneumatic ventricular assist devices

2018 ◽  
Vol 41 (10) ◽  
pp. 653-663 ◽  
Author(s):  
Damian Obidowski ◽  
Piotr Reorowicz ◽  
Dariusz Witkowski ◽  
Krzysztof Sobczak ◽  
Krzysztof Jóźwik
Keyword(s):  
Particle Image Velocimetry ◽  
Ventricular Assist Device ◽  
Particle Image ◽  
Single Case ◽  
Ventricular Assist Devices ◽  
Assist Device ◽  
Single Experiment ◽  
Ventricular Assist ◽  
University Of Technology ◽  
Image Velocimetry

Background: A pneumatic paediatric ventricular assist device developed at the Foundation of Cardiac Surgery Development, Zabrze, equipped with valves based on J. Moll’s design, with later modifications introduced at the Institute of Turbomachinery, Lodz University of Technology, was tested numerically and experimentally. The main aim of those investigations was to detect stagnation zones within the ventricular assist device and indicate advantages and limitations of both approaches. Methods: In the numerical transient test, a motion of the diaphragm and discs was simulated. Two different methods were used to illustrate stagnation zones in the ventricular assist device. The flow pattern inside the chamber was represented by velocity contours and vectors to validate the results using images obtained in the laser particle image velocimetry experiment. Results: The experimental light-based method implied problems with proper illumination of regions in the wall vicinity. High-resolution flow data and other important parameters as stagnation regions or flow patterns in regions not accessible for light in the particle image velocimetry method are derived in the numerical solution. However, computations of a single case are much more time-consuming if compared to a single experiment conducted on a well-calibrated stand. Conclusion: The resulting main vortexes in the central part of the pump chamber and the velocity magnitudes are correlated in both methods, which are complementary and when used together offer better insight into the flow structure inside the ventricular assist device and enable a deeper analysis of the results.

Particle-Image Velocimetry Study of a Pediatric Ventricular Assist Device

2010 ◽  
Vol 132 (7) ◽  
Author(s):  
E. Ferrara ◽  
M. Muramatsu ◽  
K. T. Christensen ◽  
I. A. Cestari
Keyword(s):  
Particle Image Velocimetry ◽  
Ventricular Assist Device ◽  
Particle Image ◽  
Thrombus Formation ◽  
Test Fluid ◽  
Polystyrene Spheres ◽  
Assist Device ◽  
Ventricular Assist ◽  
Strong Turbulence ◽  
Image Velocimetry

Particle-image velocimetry (PIV) was used to visualize the flow within an optically transparent pediatric ventricular assist device (PVAD) under development in our laboratory. The device studied is a diaphragm type pulsatile pump with an ejection volume of 30 ml per beating cycle intended for temporary cardiac assistance as a bridge to transplantation or recovery in children. Of particular interest was the identification of flow patterns, including regions of stagnation and/or strong turbulence that often promote thrombus formation and hemolysis, which can degrade the usefulness of such devices. For this purpose, phase-locked PIV measurements were performed in planes parallel to the diaphram that drives the flow in the device. The test fluid was seeded with 10 μm polystyrene spheres, and the motion of these particles was used to determine the instantaneous flow velocity distribution in the illumination plane. These measurements revealed that flow velocities up to 1.0 m/s can occur within the PVAD. Phase-averaged velocity fields revealed the fixed vortices that drive the bulk flow within the device, though significant cycle-to-cycle variability was also quite apparent in the instantaneous velocity distributions, most notably during the filling phase. This cycle-to-cycle variability can generate strong turbulence that may contribute to greater hemolysis. Stagnation regions have also been observed between the input and output branches of the prototype, which can increase the likelihood of thrombus formation.

Particle Image Velocimetry Measurements of Blood Velocity in a Continuous Flow Ventricular Assist Device

ASAIO Journal ◽  
2001 ◽  
Vol 47 (4) ◽  
pp. 406-411 ◽  
Author(s):  
Steven W. Day ◽  
James C. McDaniel ◽  
Houston G. Wood ◽  
Paul E. Allaire ◽  
Nicolas Landrot ◽  
...  
Keyword(s):  
Particle Image Velocimetry ◽  
Ventricular Assist Device ◽  
Continuous Flow ◽  
Particle Image ◽  
Blood Velocity ◽  
Assist Device ◽  
Ventricular Assist ◽  
Image Velocimetry

A Prototype HeartQuest Ventricular Assist Device for Particle Image Velocimetry Measurements

2002 ◽  
Vol 26 (11) ◽  
pp. 1002-1005 ◽  
Author(s):  
Steven W. Day ◽  
James C. McDaniel ◽  
Houston G. Wood ◽  
Paul E. Allaire ◽  
Xinwei Song ◽  
...  
Keyword(s):  
Particle Image Velocimetry ◽  
Ventricular Assist Device ◽  
Particle Image ◽  
Assist Device ◽  
Ventricular Assist ◽  
Image Velocimetry
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